There are some general measurement terms for Mensuration formulas Class 8. The definition and a brief description of those terms are given here.
Perimeter: The boundary length of the plane figures is called the perimeter. The unit of the perimeter is km or m or cm.
Area: The boundary closed surface of any solid geometric figure is the area. The unit of area is km^2 or m^2 or cm^2.
Surface Area: The sum of the surface area of any three-dimensional figure is called the surface area.
Lateral Surface Area: The top and bottom surface areas of any three-dimensional figure are called lateral surface areas.
Volume: Volume is the amount of space captured by any three-dimensional figure.
Radius: The radius of a circular base is also the radius of a three-dimensional figure.
Height: The length of the axis of any solid three-dimensional figure is height.
Here, we have provided all two-dimensional figure Mensuration Class 8 formulas in a tabular form.
Formulas of Two Dimensional Figure – Table will be updated soon.
(image will be uploaded soon)
Here are the menstruation Class 8 formulas of the measurements of cubes and cuboids.
Formula of Volume and Surface Area of Cube and Cuboid – Table will be updated soon.
The right circular cylinder is a unique three-dimensional figure. The Mensuration formulas Class 8 of the right circular cylinder are mentioned below in the table.
Formula of Volume and Surface Area of Right Circular Cylinder – Table will be updated soon.
Solved Examples
1. Calculate the area of a square. The side length of the square is 20 m.
Solution:
The side length, a = 20 m.
Hence, the area of the square = a2
= (20)2 m2
= 400 m2
2. Calculate the perimeter of a rectangle. The length is 5 m, and the width is 3 m.
Solution:
The length, L = 5 m.
The width, B = 3 m.
Therefore, the perimeter of the rectangle is
2 (L+B)
= 2 (5+3) m
= 16 m.
3. Find out the area and perimeter of a circle. The radius is 7 m.
Solution:
The radius of the circle, r = 7m.
Therefore,
The parameter of the circle,
2πr
= (2π × 7) m
= 44 m
The area of the circle,
πr2
= (π × 72) m2
= 154 m2